Gaya APA

Lindberg, K., Hawkins, D, E. (1993). Ecotourism : a guide for planners and managers . North Bennington, VT: The Ecotourism Society.

Gaya MLA

Lindberg, Kreg., Hawkins, Donald, E.. "Ecotourism : a guide for planners and managers". North Bennington, VT: The Ecotourism Society, 1993. Text.